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Re:Ask HN: Building a side project that makes money. Where t... by j_s on Wednesday April 05, 2017 @07:37AM (#14041310)
This technique also works for Wordpress plugins, and just about any other paid category with reviews.

You can go into wordpress.org, just take a look at the download numbers and it will tell you flat out like whether somebody’s downloads are increasing overtime or are they decreasing, when the last updates were, all that kind of information. And you can get a sense from that information alone as to whether or not it would be possible to put another plugin that offers similar functionality

http://www.startupsfortherestofus.com/episodes/episode-249-f... (search "12:54")

Re:Ask HN: Building a side project that makes money. Where t... by rograndom on Wednesday April 05, 2017 @12:29PM (#14043301)
You can also find WordPress plugins that have a good install base, but the author is looking for someone to adopt.

I adopted a refer spam blocker plugin (https://wordpress.org/plugins/block-referer-spam/), added some features for a paid version (https://www.blockreferspam.com/) and it's doing pretty well.